log（0.9，9）
    1500×[(1-22%-40%-9%)×(1+10%)+22%×(1+10%)+40%×(1+15%)+9%×(1+5%)]
    5329/23+300
    6-3（2×2）
    √114514
    900÷0.5
    50*5.3893+1202.8/1.07^7
    20*1.06^7
    50*4.7665+1134.8/1.07^6
    20*1.06^6
    1115.01/26.76
    50*4.2124+1070.4/1.06^5
    50*4.1002+1070.4/1.07^5
    20*1.06^5
    800^2
    1197.2/1.1^4+1000*0.05*3.1699
    60/1.5+40/2.4
    1197.2/1.09^4+1000*0.05*3.2397
    (（1197.2-1000）/4+50)/1000
    50/1.1+1000/1.1

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